Melting silver problem

[Helynwilder]

Hi Im having a problem melting silver to do casting. Ive done it before but only in college with their kit. This time with new silver at home. The silver melted ok but in a pool of pale green liquid. I had just bought a new crucible and prepared it by glazing as instructed. Ive got a feeling this glaze is what melted along
with the silver and when I poured it it set and blocked the sprue and the silver set behind it. Any help or suggestions please.